To explain or clarify something by using examples, pictures, or other visual aids.
Here are some examples:
* "The teacher illustrated the concept of photosynthesis with a diagram."
* "The author illustrated his point with a personal anecdote."
* "The book is beautifully illustrated with full-color photographs."
Other meanings:
* To illuminate or decorate.
* "The stained glass window illustrated the story of the saints."
* To make something visually clear or obvious.
* "The data illustrates the growing demand for electric vehicles."
Note: "Illistrate" is not a word in the English language.